/*
 * MIT License
 *
 * Copyright (c) 2020 wen.gu <454727014@qq.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

 /***************************************************************************
 * Name: shared_memory.cpp
 *
 * Purpose: shared memory implementation.
 *
 * Developer:
 *   wen.gu , 2019-10-06
 *
 * TODO:
 *
 ***************************************************************************/

 /******************************************************************************
 **    INCLUDES
 ******************************************************************************/
#include "panda/core/shared_memory.h"
#include "panda/core/internal/shared_memory_impl.h"


namespace panda
{
namespace core
{
/******************************************************************************
 **    MACROS
 ******************************************************************************/



/******************************************************************************
 **    VARIABLE DEFINITIONS
 ******************************************************************************/



/******************************************************************************
 **    inner FUNCTION DEFINITIONS
 ******************************************************************************/
class SharedMemory::impl
{
public:
    internal_impl::SharedMemObj* mShm = nullptr;
    std::string mName = "";
public:
    ~impl()
    {
        if (mShm)
        {
            internal_impl::SharedMemoryFree(mShm);
            mShm = nullptr;
        }
    }
};



/******************************************************************************
 **    FUNCTION DEFINITIONS
 ******************************************************************************/
//static 
SharedMemory* SharedMemory::alloc(const std::string& name, uint32_t size)
{
    SharedMemory* retShm = nullptr;
    internal_impl::SharedMemObj* shm = internal_impl::SharedMemoryAlloc(name, size);

    if (shm)
    {
        retShm = new SharedMemory;
        retShm->mImpl->mShm = shm;
        retShm->mImpl->mName = name;
    }

    return retShm;
}

//static 
SharedMemory* SharedMemory::attach(const std::string& name)
{
    SharedMemory* retShm = nullptr;
    internal_impl::SharedMemObj* shm = internal_impl::SharedMemoryAttach(name);

    if (shm)
    {
        retShm = new SharedMemory;
        retShm->mImpl->mShm = shm;
        retShm->mImpl->mName = name;
    }

    return retShm;
}


SharedMemory::SharedMemory()
    :mImpl(new impl)
{
    /** todo something */
}

SharedMemory::~SharedMemory()
{
    /** todo something */
}


uint8_t* SharedMemory::data()
{
    return internal_impl::SharedMemoryData(mImpl->mShm);
}

uint32_t SharedMemory::size()
{
    return internal_impl::SharedMemorySize(mImpl->mShm);
}

std::string SharedMemory::name()
{
    return mImpl->mName;
}



} /** namespace core */
} /** namespace panda */